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Q.

An engine accelerates a car of mass 800 kg to a speed of 72 km/h. If the frictional force is 10 N per ton, the power developed by the engine is:

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answer is 4.

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Detailed Solution

Speed of car, v = 72 km/h = 72 × 518 = 20 ms-1KE = 12mv2 = 12×800×400 = 400 × 400 JP = KEtime= 400×40032= 5000 W = 5 kW

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